Objective-C Json 使用，objective-cjson

Objective-C Json 使用，objective-cjson

Objective-c json

通過使用NSJSONSerialization 可以Json與Foundation的相互轉換。下面具體介紹 Objective-c json 的使用。

Json To Fundation

使用 JSONObjectWithData 可以將 Json 轉化為 Foundation。Json的頂層可以是{} 或 []因此可以有 NSDictionary 和 NSArray 兩種格式。讀取使用 ObjectForKey 返回對應的對象。

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NSString* items = @"{"items":["item0","item1","item2"]}"; NSData *data= [items dataUsingEncoding:NSUTF8StringEncoding]; NSError *error = nil; id jsonObject = [NSJSONSerialization JSONObjectWithData:data                     options:NSJSONReadingAllowFragments                     error:&error]; if ([jsonObject isKindOfClass:[NSDictionary class]]){     NSDictionary *dictionary = (NSDictionary *)jsonObject;     NSLog(@"Dersialized JSON Dictionary = %@", dictionary); }else if ([jsonObject isKindOfClass:[NSArray class]]){     NSArray *nsArray = (NSArray *)jsonObject;     NSLog(@"Dersialized JSON Array = %@", nsArray); } else {     NSLog(@"An error happened while deserializing the JSON data."); } NSDictionary *dict = (NSDictionary *)jsonObject; NSArray* arr = [dict objectForKey:@"items"];NSLog(@"list is %@",arr);

Fundation To Json

使用 dataWithJsonObject 可以將 Fundation 轉換為 Json。其中 options:NSJSONWritingPrettyPrinted 是分行輸出json ,無空格輸出使用 option:kNilOptions。

下面這段代碼是IOS內購擷取商品列表。擷取後，將內容添加到Json中。

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NSArray *myProduct = response.products;NSDictionary *myDict;NSMutableDictionary *dict = [NSMutableDictionary                                 dictionaryWithCapacity: 4]; for(int i  = 0;i<myProduct.count;++i){     //NSLog(@"----------------------");    //NSLog(@"Product title: %@" ,[myProduct[i] localizedTitle]);    //NSLog(@"Product description: %@" ,[myProduct[i] localizedDescription]);    //NSLog(@"Product price: %@" ,[myProduct[i] price]);    //NSLog(@"Product id: %@" ,[myProduct[i] productIdentifier]);     myDict = [NSDictionary dictionaryWithObjectsAndKeys:                    [myProduct[i] localizedTitle], @"title",                    [myProduct[i] localizedDescription], @"desc",                    [myProduct[i] price], @"price",                    [myProduct[i] productIdentifier], @"product", nil];     [dict setValue: myDict forKey: [myProduct[i] productIdentifier]];}if([NSJSONSerialization isValidJSONObject:dict]){    NSError* error;    NSData *str = [NSJSONSerialization dataWithJSONObject:dict                         options:kNilOptions error:&error];    NSLog(@"Result: %@",[[NSString alloc]initWithData:str                             encoding:NSUTF8StringEncoding]);}else{    NSLog(@"An error happened while serializing the JSON data.");}

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